JP2017096494A - Secure tube coupling with automatic connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secure tube coupling with automatic connection.SOLUTION: A tube coupling (1) includes a female connector (2) with a body (3) into which a male connector (6) having an annular collar (7) is inserted axially, and a connection element (10) that extends in a transverse direction within the body (3) of the female connector (2). The connection element (10) is designed to interfere mechanically with the collar (7) during insertion of the male connector (6) and to move transversely of its own accord towards the inside of the female connector (2). The connection element (10) includes a locking hook (16) that co-operates with a locking catch (12) provided in the female connector (2), and the hook (16) passes through the catch (12) as a result of the mechanical interference of the collar (7) that drives axial and radial elastic deformation of the connection element (10). The hook (16) locks against catch (12) when the connection element (10) is fully pushed into the female connector (2).SELECTED DRAWING: Figure 1

Description

  The present invention relates to the field of tube couplings for connecting together fluid pipes or hoses, such as fuel hoses for motor vehicles.

  More particularly, the present invention is a tube coupling, a female connector having a body defining an orifice into which a male connector having an annular collar is inserted along an axial direction, and a female connector A connecting element extending in a transverse direction in a recess in the body, and elastically diameters outwardly of the female connector by mechanical interference with the collar during insertion of the male connector into the female connector. A coupling element designed to be deformed in a direction and designed to move spontaneously along the transverse direction towards the inside of the female connector in response to a radial elastic deformation, It relates to tube coupling.

  Such tube couplings for connecting fuel hoses are already known, in particular from WO 2015/177472 and US 2012/0326435.

  In the known tube coupling of US 2012/0326435, the connecting element constitutes a holding element, which holds the male connector, which is pushed completely into the female connector. And then blocking in place to form a transversely extending lock behind the collar of the male connector in the female connector so as to block it axially.

  The coupling or holding element comprises two teeth, such as a U-shaped fork, spaced apart from each other, the teeth extending transversely inside the female connector, each tooth Has a front surface that interferes with the collar of the male connector.

  The connecting element is initially positioned in the female connector in a high assembly ready position, in which the U-shaped base projects outside the female connector and the two teeth of the connecting element are male. Substantially extends to the front of the collar on both sides of the connector (the front of the collar corresponds to the front of the collar further downstream along the axis in the direction for inserting the male connector into the female connector) .

  When the male connector is pushed axially into the female connector, the front face of the collar of the male connector is then connected to the teeth of the connecting element that is also inclined with respect to the axial direction and also to the transverse direction. Interfering with the front of the unit. As a result, the teeth of the connecting element are elastically separated in the radial direction by reacting to the propulsive force exerted in the axial direction with respect to the oblique front surface, and with respect to the oblique front surface. The reaction to the thrust exerted in the transverse direction causes the connecting element to move in the transverse direction within the female connector. When they are elastically separated in the radial direction, the elastic tooth portion accumulates entrainment energy. The maximum spacing of the elastic teeth moving in the transverse direction of the connecting element corresponds to the diameter of the collar.

  During the downstream movement of the connecting elements in the female connector, the teeth are split above the collar until they reach the maximum spacing, ie the diameter of the collar. Thereafter, after passing the diameter, the energy stored by the elastic spacing causes the teeth to retract due to the propulsion component extending in the transverse direction, and the transverse movement of the connecting element is slightly toward the inside of the female connector. Last for.

  This results in coupling by automatic connection.

  In prior art tube couplings, the connecting element also has a fixed frame that extends transversely inside the female connector parallel to the teeth of the connecting element and at its base. And an elastic protrusion extending obliquely with respect to the axis of the female connector.

  The tip is arranged so that while the male connector is axially pushed into the female connector, the male connector pushes the tip and thereby moves it axially relative to its base. The As a result, the elastic tip is compressed and stores energy, and after the elastic teeth of the connecting element exceed the diameter of the collar while the connecting element is moving in the transverse direction, the protruding tip is released, Produces a propulsive force on the connecting element that tends to urge the connecting element in a transverse direction toward the inside of the female connector.

  The connecting element is then in its lower position, which forms a lock that prevents axial movement of the male connector within the female connector. In this low position, the connecting element appears to be effectively retracted into the female connector. The prongs then allow to extend the pushing of the connecting element into the female connector after the diameter of the male connector collar is exceeded while the connecting element is moving in the transverse direction.

  Nevertheless, this known tube coupling has several drawbacks.

  Initially, this requires multiple separate parts that interact with each other to hold or block the male connector within the female connector and automatically move the coupling element toward the inside of the female connector. To do.

  These various parts need to be linked to each other dynamically and complexly. They also increase the cost of making the tube coupling. This tube coupling also has a body with a large number of perforations, thereby reducing its robustness.

  Thereafter, the stroke after the connecting element exceeds the collar is determined by the magnitude of the deformation of the tip, and in fact, the stroke is relatively small because the part is miniaturized.

  As a result, the spacing between the high assembly ready position and the low position of the coupling element is small, and this difference is difficult to perceive, whether visually or due to contact.

  Furthermore, in existing tube couplings, when the connecting element is in a low position in the female connector, the teeth are subjected to sustained mechanical stress, thereby causing wear of the element and the tube coupling is heated. If done, there is a possibility of damage due to creep.

  Finally, it is known that the male connector can be disconnected from the female connector by pulling the male connector in the axial direction while removing the lock, making the tube coupling safer Need to be done.

International Publication No. 2015/177472 US Patent Application Publication No. 2012/0326435

  The object of the present invention is therefore to mitigate the drawbacks mentioned above.

  To achieve this, the present invention provides a female connector having a body that defines an orifice into which a male connector having an annular collar is inserted axially into a tube coupling, and a female connector. A connecting element extending in a transverse direction in a recess in the body of the body, elastically towards the outside of the female connector by mechanical interference with the collar during insertion of the male connector into the female connector Designed to be deformed radially and in response to radial elastic deformation, it is designed to move spontaneously along the transverse direction towards the inside of the female connector, and the connecting element is female At least one locking hook cooperating with a locking catch provided in the body of the connector, the locking position when the coupling element is fully pushed into the body of the female connector A tube coupling with a locking element, with a locking hook, with a locking hook, wherein the locking element is initially the body of the female connector while the coupling element and the body of the female connector are in mechanical interference In the axial direction and then in response to the axial and elastic deformation of the coupling element, the coupling element is moved so that the hook turns around the locking catch to reach the closed position on the locking catch. Provided is a tube coupling, characterized in that it is designed to be deformed radially.

The coupling of the present invention can have the following characteristics:
The connecting element is in the form of two forks comprising a first U-shaped fork forming a lock on the collar and a second U-shaped fork forming a yoke, the fork being U-shaped Connected to each other at the base, the second U-shaped fork has two branches, each provided with a locking hook having an opening facing in the radial direction.

  The opening of each hook is located above the locking catch that forms the abutment for the connecting element in the partly pushed position of the connecting element into the body of the female connector, Within the recess in the connector body, each catch is located in a gap zone in which each hook moves axially and turns around the catch.

  -Each hook of the coupling element is provided with a retaining finger that prevents the coupling element from moving in the transverse direction within the gap zone inside the recess of the female connector.

  The front interference surface of each branch is an inclined surface that is inclined with respect to the axial direction and is arranged below the central portion of the axial orifice of the female connector to interfere with the collar of the male connector Formed by an oblique surface.

  Each branch of the coupling element has a rear surface opposite to the interference front provided with a peg, whereby the coupling element is bifurcated under the influence of mechanical interference of the male connector on the coupling element To bend against the main body of the female connector.

  The coupling element is flush with the outer surface of the female connector body when it is fully pushed into the recess of the female connector, at which position this is the proper assembly applied to the coupling element; Hide the visual indicator to verify.

  The coupling is further a clip designed to be inserted into the coupling element when the coupling element is fully inserted into the body of the female connector, so that the coupling is properly assembled; A clip is provided that acts as an indicator for verification.

  The idea on which the present invention is based is thus directed towards the inside of the female connector in the transverse direction of travel of the coupling element, the energy released by the coupling element when elastically retracting both radially and axially. An effective conversion to controlled propulsion is to safely lock the coupling element to the female connector.

  The arrangement of the present invention allows the coupling element to have a position difference between a high assembly ready position and a low locking position, and this position difference indicates whether the male connector is fully connected within the female connector. It is large enough to constitute a reliable indicator that can be inspected visually or by contact to find out.

  Furthermore, the arrangement of the present invention may be implemented in a female connector body that remains relatively closed (ie, hardly perforated), and thus, such as dust that becomes deposited inside the female connector. It makes it possible to reduce the influence of pollutants and increases the robustness of the body.

  Other characteristics, advantages and details of the invention will become apparent upon reading the following description of embodiments of the invention given by way of non-limiting illustration, the description being referred to the figures summarized below. Done.

  The invention can be better understood and other advantages will become apparent upon reading the following description and the accompanying drawings.

1 is a schematic exploded view of a tube coupling of the present invention comprising a female connector, a ring inside the female connector, a coupling element, and a male connector. FIG. It is a schematic exploded view of the tube coupling of this invention provided with the female connector, the ring inside a female connector, and a connection element. Figure 2 is a side view of two different cross sections showing the tube coupling of the present invention in an assembly ready position. Figure 2 is an end view of two different cross sections showing the tube coupling of the present invention in an assembly ready position. 1 is a cross-sectional side view of a tube coupling of the present invention in a first state of mechanical interference with a male connector. FIG. 1 is a cross-sectional end view of a tube coupling of the present invention in a first state of mechanical interference with a male connector. FIG. FIG. 4B is an enlarged view of a portion of FIG. 4A. FIG. 6 is a side view of two different cross sections of a tube coupling of the present invention in a second mechanical interference with a male connector. FIG. 3 is an end view of two different cross sections of a tube coupling of the present invention in a second mechanical interference with a male connector. FIG. 2 is a two-section side view showing the tube coupling of the present invention in a first intermediate state while the connecting element is lowered into the female connector. FIG. 3 is an end view of two cross sections showing the tube coupling of the present invention in a first intermediate state while the connecting element is lowered into the female connector. FIG. 3 is a two-section side view of the tube coupling of the present invention in a second intermediate state while the coupling element is lowered into the female connector. FIG. 6 is an end view of two cross sections showing the tube coupling of the present invention in a second intermediate state while the connecting element is lowered into the female connector. FIG. 2 is a side view of two cross sections showing the coupled tube coupling of the present invention. FIG. 2 is an end view of two cross sections illustrating the coupled tube coupling of the present invention. FIG. 6 is a cross-sectional side view of a tube coupling in an assembly ready position in a particular embodiment of the present invention having a clip as a suitable assembly indicator. FIG. 6 is a cross-sectional end view of a tube coupling in an assembly ready position in a particular embodiment of the present invention having a clip as a suitable assembly indicator. FIG. 6 is a cross-sectional side view of connected tube couplings showing clips in an elevated position in certain embodiments of the invention. FIG. 6 is an end view of a cross-section of connected tube couplings showing a clip in an elevated position in certain embodiments of the invention. FIG. 5 is a cross-sectional side view of connected tube couplings in a low position in certain embodiments of the invention. FIG. 6 is an end view of a cross-section of connected tube couplings in a low position in certain embodiments of the invention.

  1 and 2 are exploded views of various parts constituting the tube coupling 1 of the present invention. In this example, the tube coupling 1 is a female tubular connecting end portion (female connector) 2 composed of two parts, and has a tubular shape extending along the axial direction A, and has an axial opening. A female tubular connection end comprising a main body 3 provided with 4 and a ring 5 engageable in the axial direction in the opening 4 of the main body 3.

  It should be understood that the present invention extends to a female end piece that is integrally fabricated as a single piece.

  In the tube coupling 1, the male tubular connecting end (male connector) 6 is designed to be inserted into the female connector 2, specifically in this example the ring 5.

  The male connector 6 is in the form of an elongated cylindrical tube, which has an annular collar on its circular circumference, and the diameter of the annular collar 7 is slightly smaller than the inner diameter of the ring 5.

  Also, as can be seen in FIG. 1, the main body 3 of the female connector 2 has an upper part such as a sliding surface into which the connecting element 10 can be inserted and slid in the transverse direction. A shaped inner recess 8 is shown showing the radial opening 9 to be formed. In the part located below the center of the axial opening 4, the inner recess 8 has two gap zones 11, which are radial slots provided in the annular peripheral surface of the female connector 2. Are arranged symmetrically. These radial slots allow the bifurcations (described below) of the connecting element 10 to diverge radially and expand inside the body of the female connector 2.

  As can be seen in FIG. 2, in the bottom portion 3 of the female connector 2, the gap zone 11 has a locking catch 12 arranged axially and a space 13 adjacent to the catch 12. Another catch 12 with a space 13 not visible in the figure is placed in another gap zone which is symmetrical with respect to the gap zone 11 which can be seen in FIG.

  The locking catch 12 may be rectangular in shape, but it is also inclined with respect to the transverse direction in which the coupling element 10 is inserted and acts as a ramp for sliding of the coupling element 10 as shown. An oblique surface may be used.

  On the outer circumference, the body 3 of the female connector 2 has a shoulder 112 adjacent to each catch 12 and forming as a stop for the connecting element 10. In this example, the connecting element 10 is in the form of two forks, an inverted U-shaped first fork that forms the lock 30 and an inverted U-shaped second fork that forms the yoke 14. The two forks are connected to each other via a U-shaped base.

  The first fork forming the lock 30 is designed to be placed behind the collar 7 of the male connector 6 so that it is pushed completely inside the female connector 2. Hold it in the axial direction and lock it. The lock 30 has two branches that are spaced apart from each other and extend in the transverse insertion direction. The branch portion of the lock 30 is shaped to have a radius of curvature corresponding to the diameter of the cylindrical tube of the male connector 6. Each of the end portions of the branch portion of the lock 30 has a chamfered portion 31 that extends in the axial direction and is inclined toward the outside of the lock 30. The end of each branch portion of the lock 30 in the vicinity of the chamfered portion 31 does not exceed the center of the axial opening 4 in the female connector 2.

  The second fork has two flexible branches 15 which are placed apart from each other and extend in the transverse insertion direction. The two branches 15 are shaped to form something like a cross member that slides in a slot in the sliding surface defined by the radial recess 8. Each flexible branch 15 has a C-shaped locking hook 16 at its free end, and the C-shaped open side has a diameter toward the inside of the orifice in the main body 3 of the female connector 2. Turn to the direction. These two C-shapes face each other. More specifically, the end portion of each branch portion 15 is constituted by a C-shaped base portion of the hook 16.

  Each flexible branch 15 of the coupling element 10 has a front surface facing the collar 7 of the male connector 6 when it is engaged in the female connector 2, and a front surface for interference with the collar 7. It is called.

  In the portion located below the center of the axial opening 4 in the female connector 2, the front surface of each branch portion 15 has an oblique surface or feeler 17 inclined with respect to the axial insertion direction of the male connector 6. The slanted surface or feeler 17 faces the inside of the orifice 4 of the male connector 2 and the male connector 6 is in the female connector 2 when the connecting element 10 is in a high assembly ready position inside the female connector 2. When it is pushed in, it works to interfere with the front surface of the collar 7.

  In addition to its front surface, each of the hooks has a retaining finger 18 or knob on a C-shaped base that protrudes axially from the front surface for the functions described below. The total thickness in the axial direction A of the hook 16 and the holding finger 18 is larger than the space 13 adjacent to the catch 12.

  In a particular embodiment, the peg 19 projects axially from the rear surface of each flexible branch 15 of the coupling element 10 from the C-shaped central portion of the hook 16 as can be seen in FIG. . The function of the peg 19 is described below.

  As will be explained below, the flexible branch 15 of the coupling element 10 allows the coupling element 10 to move spontaneously in the transverse direction T towards the inside of the female connector 2 as a result of the driving force. Arranged and propulsive force is generated by the reaction to the elastic deformation of the flexible branch 15 acting in the axial direction and then in the radial direction, as occurs when the male connector 6 is pushed into the female connector 2.

  In FIG. 3A and FIG. 3B, the connecting element 10 is in a high assembly ready position within the female connector 2. In the high assembly ready position of the coupling element 10, the top of the coupling element 10 protrudes sufficiently from the upper outer surface of the female connector 2, for example from about 3 millimeters (mm) to 4 mm, so that the operator can visually or tactilely Inspection ensures that a high assembly ready position of the connecting element 10 in the female connector 2 and a locking position of the connecting element 10 can be distinguished.

  In this high assembly ready position, the flexible branch 15 is in a stationary position and the opening in each hook 16 of the coupling element 10 is above the corresponding locking catch 12 in the body 3 of the female connector 2. This catch constitutes an abutment for the connecting element 10. Therefore, the connecting element 10 cannot be accidentally inserted in the transverse direction.

  The order of movement spontaneously made by the connecting element 10 in the female connector 2 will be described below with reference to FIGS.

  4A, 4B, and 4C, the male connector 6 is partially inserted into the female connector 2.

  The upper periphery of the collar 7 of the male connector contacts the branch portion of the lock 30 of the connecting element 10 via the chamfered portion 31. By pushing the male connector 6 axially into the orifice of the female connector 2, the collar 7 causes mechanical interference to the feeler 17 of the flexible branch 15 of the connecting element 10 due to axial pressure. Effect. This axial driving force moves the flexible branch 15 in the axial direction, but does not separate the branch 15 in the radial direction, because the holding finger 18 on the front surface of the hook 16 is connected to the female connector. 2 is still in contact with the locking catch 12 of the body 3, which prevents the connecting element 10 from proceeding transversely into the gap zone 11 inside the recess 8 of the female connector 2.

  The maximum axial movement of the branch portion 15 is obtained when the rear surface of the flexible branch portion 15 is in contact with the inside of the main body 3 of the female connector 2 in the axial direction. In a particular embodiment in which the abutment peg 19 is arranged on the rear face of the branch 15, the maximum axial movement is obtained when the peg 19 abuts the inside of the body 3 of the female connector 2, which is , Can be seen in the enlarged view of FIG. 4C. In this particular configuration, the branch 15 tends to bend under the influence of mechanical interference of the male connector 6 with respect to the connecting element 10.

  As can be seen in FIGS. 5A and 5B, the male connector 6 is pushed a little further into the female connector 2. The collar 7 continues to exert axial pressure on the feeler 17, but the branch 15 is in contact with the body 3 of the female connector 2, so that they are here divided in the radial direction, as shown in FIG. Reach the maximum distance so that it can be seen. In this spaced apart configuration of the flexible branch 15, the hook 16 is positioned beyond the locking catch 12 and during the downward transverse movement of the coupling element 10 into the female connector 2, the hook 16. It can be clearly seen in FIG. 5B that it rotates around the locking catch 12 in the gap zone 11 of the female connector 2 (in the manner described below).

  By further pushing the male connector 6 into the female connector 2, the collar 7 loses contact with the feeler 17 of the connecting element 10 and the branch 15 slides diametrically on the rear surface of the collar 7. Retreat by. The collar 7 is blocked behind the branch of the lock 30, which is held between the retracted flexible branch 15.

  When the flexible branches 15 are elastically retracted, they also move radially towards each other while retreating axially in the direction opposite to the direction for inserting the connecting element 10. To return to its original rest position. These two retracted movements generate a driving force for the coupling element 10, so that the coupling element 10 is in a low holding and locking position within the female connector 2, as shown in FIGS. It spontaneously moves in the recess 8 in the transverse direction toward the inside of the female connector 2 until it reaches. It should be understood that in order to go around the catch 12 as described above, the hook 16 performs a first movement by the axial protrusion and is then radially spaced apart. When the male connector 6 is fully pushed into the female connector 2, the hook 16 returns to the rest position in the axial direction, so that the hook 16 is radially engaged with the side of the catch 12, These are held by moving radially below the catch 12, at which time the holding finger 18 is received below the shoulder 112.

  The low position of the coupling element 10 is shown in FIGS. 8A and 8B. In this low position, it can be seen that the catch 12 is received within the C-shape of the hook 16. In this position, the connecting element 10 can no longer move upward in the transverse direction within the body 3 of the female connector 2. The male connector 6 is blocked in the female connector 2 in the axial direction. As a result of this arrangement, the tube coupling 1 is completely safe.

  Furthermore, in this low holding position, the upper part of the connecting element 10 (ie the U-shaped base of the two forks) is flush with the outer surface of the female connector 2 (upper surface in the figure).

  It can be seen that according to the invention, the mechanisms for moving the connecting element 10 in the transverse direction are all inside the female connector 2, whereby the overall size of the tube coupling 1 can be reduced.

  It is also possible to provide a visual indicator in the tube coupling 1 of the present invention to verify that the male connector 6 has been fully pushed into the female connector 2, at which time On the connecting element 10 it is provided in the form of a mark which is covered and thus hidden when inserted into the female connector 2.

  The connecting element 10 in the automatically connecting secure tube coupling 1 of the present invention can be adapted to male connectors 6 having different shapes or different diameters, and to collars 7 having different radii.

  The tube coupling 1 of the present invention has several separate parts, all of which can be made from a plastic material, for example by injection molding or by 3D printing.

  In a variant embodiment of the invention, measures can be taken in the tube coupling 1 as shown in FIGS. 9A to 11A of a clip 20 that acts as an indicator showing the two stages of assembling the coupling. 9A and 9B, the coupling element 10 is in its high assembly ready position. When the male connector 6 is properly inserted into the female connector 2, the clip 20 protrudes from the coupling, i.e. it is in a high position, as can be seen in FIGS. 10A and 10B, and therefore Allows the operator to perform a first visual and / or tactile verification that the coupling has been properly assembled.

  A second verification is then performed by the second operator, which then confirms that the clip 20 is in the protruding position and pushes it manually into the coupling, thereby This is no longer in the protruding position, i.e., this places it in a low position as can be seen in Figs.

  This two-step verification makes it possible to confirm that the coupling is properly assembled, thereby suppressing assembly errors on the assembly line.

  In this example, the clip 20 is in the form of a fork composed of two substantially flexible parallel teeth, as can be seen in FIGS. 9A-11B.

  The teeth of the clip 20 are designed to be inserted into the respective groove 21 of the connecting element 10 provided for insertion purposes in the transverse direction T shown in FIG. 9B before inserting the male connector 6. Is done.

  After the flexible teeth of the clip 20 are inserted, they exert pressure on the inner profile of the female connector 2 and indicate an unintended withdrawal of the clip 20.

  While the male connector 6 is inserted into the female connector 2, the coupling element 10 remains inside the female connector 2 to lock the male connector 6 while the clip 20 remains protruding from the coupling in a high position. It can also be seen that it moves in a transverse direction towards After the male connector 6 has been correctly inserted, the end of the teeth of the clip 20 is positioned on the male connector 6 and the clip 20 is moved downward without any additional propulsive force. Prevent low position.

  It should be noted that the mechanism for lowering the coupling element 10 does not interact with the mechanism for lowering the clip 20 because the clip 20 is arranged to be manually pushed into its lower position by the operator.

1 Tube Coupling 2 Female Connector 3 Main Body 4 Axial Opening, Orifice 5 Ring 6 Male Connector 7 Annular Collar 8 Recess 9 Radial Opening 10 Connecting Element 11 Gap Zone 12 Rocking Catch 13 Space 14 York 15 Branch , Flexible branch portion 16 locking hook 17 feeler 18 holding finger 19 peg 20 clip 21 groove 30 lock 31 chamfered portion 112 shoulder

Claims (8)

  Female with tube coupling (1) and body (3) defining an orifice (4) into which a male connector (6) with an annular collar (7) is inserted along the axial direction (A) A connector (10) extending in a transverse direction (T) in a recess (8) in the body (3) of the female connector (2) and the female connector (2), the male connector During the insertion of the female connector (6) into the female connector (2), it is elastically deformed radially toward the outside of the female connector (2) by mechanical interference with the collar (7). And also designed to move spontaneously along the transverse direction (T) toward the inside of the female connector (2) in response to the radial elastic deformation, the coupling element (10) is provided in the main body (3) of the female connector (2). At least one locking hook (16) cooperating with the locking catch (12) provided, the coupling element (10) being fully pushed into the body (3) of the female connector (2) A tube coupling comprising a coupling element (10) comprising a locking hook (16), sometimes closing the catch (12) in a locking position, wherein the coupling element (10) and the female connector ( During the mechanical interference of the body (3) of 2), the locking hook (16) is first axially projected into the body (3) of the female connector (2), after which In response to the axial and elastic deformation of the coupling element (10), the hook (16) moves the lock to reach the closed position on the locking catch (12). As moves around the ring catch (12), characterized in that it is designed so that the coupling element (10) is radially deformed, the tube coupling.   The form of the two forks in which the connecting element (10) comprises a first U-shaped fork that forms a lock on the collar (7) and a second U-shaped fork that forms a yoke (14). The forks are connected to each other at a U-shaped base, and the second U-shaped fork has two branch portions each provided with a locking hook (16) having an opening facing in the radial direction. Coupling (1) according to claim 1, characterized in that it has (15).   In the position where the coupling element (10) is partially pushed into the body (3) of the female connector (2), the opening of each hook (16) is for the coupling element (10). Located above the locking catch (12) forming the abutment and within the recess (8) of the body (3) of the female connector (2), each catch (12) Coupling (1) according to claim 2, characterized in that (16) is arranged in a gap zone (11) that moves axially and turns around the catch (12).   Each hook (16) of the connecting element (10) has the connecting element (10) in a transverse direction within the gap zone (11) inside the recess (8) of the female connector (2). Coupling (1) according to claim 3, characterized in that a holding finger (18) is provided which prevents movement.   The front interference surface of each branch portion (15) is an inclined surface (17), which is inclined with respect to the axial direction and interferes with the collar (7) of the male connector (6). 3. Coupling (1) according to claim 2, characterized in that it is formed by an oblique surface arranged below the center of the axial orifice (4) of the female connector (2).   Each branch (15) of the connecting element (10) has a rear surface opposite to the interference front, provided with a peg (19), whereby the connecting element (10) is connected to the connecting element. Abutting the body (3) of the female connector (2) to twist the branch (15) under the influence of the mechanical interference of the male connector (6) with respect to (10); Coupling (1) according to claim 3, characterized in.   The connecting element (10) is flush with the outer surface of the body (3) of the female connector (2) when it is fully pushed into the recess (8) of the female connector (2). 7. In this position, the coupling element (10) hides a visual indicator for verifying proper assembly applied to the coupling element (10). Coupling (1) as described in any one.   A clip (20) designed to be inserted into the connecting element (10) when the connecting element (10) is fully inserted into the body (3) of the female connector (2); 8. The clip according to any one of the preceding claims, further comprising the clip (20) serving as an indicator for verifying that the coupling (1) is properly assembled. Coupling (1) as described.

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